Preface
Why keep talking at length? In all the three worlds involving moving and non-moving entities, there is nothing that can be without mathematical sciences.
Mahavira (c. 850 ad)Indian Mathematician
When you can measure what you are speaking about and express it in numbers you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science.
Lord Kelvin (William Thomson) 1883
Interactions of energetic electrons and photons with atoms, molecules, excited states, and ions are generally understood to fall in the domain of gaseous electronics. ...
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